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What does your HbA1c mean? Normal range, prediabetes and diabetes

What your "3-month sugar" test measures and the cut-offs Indian guidelines use. Also: why anaemia can mislead it, and what it costs.

GLP Guidebook teamPublished 5 Oct 202616 min read23 sourcesWritten from published sources

Written for India. Reading from the US? US versionComing soon

The short answer

HbA1c is a blood test that shows your average blood sugar over the past 2 to 3 months. Below 5.7% (39 mmol/mol) is normal and 5.7% to 6.4% is prediabetes. 6.5% (48 mmol/mol) or above is the diabetes range. India's ICMR and RSSDI use the same lines, but anaemia can push the number up.

Key takeaways

  • An HbA1c below 5.7% is normal, 5.7% to 6.4% is prediabetes, and 6.5% or above points to diabetes, in both the ADA 2026 and the ICMR treatment workflow.1,4
  • HbA1c measures how much of your haemoglobin carries sugar, so it reflects your average blood sugar over about 2 to 3 months.2,9
  • India's RSSDI-ESI guideline says HbA1c should not be the only test used to diagnose diabetes in Indian settings, partly because anaemia is common.5
  • In a Delhi study of iron-deficiency anaemia, HbA1c averaged 5.51% vs 4.85% in healthy people, and fell after 3 months of iron.10
  • For most adults with diabetes, the ICMR workflow and the ADA set an HbA1c target of about 7% or below, with higher targets for many older people.2,4
On this page
  1. What does an HbA1c test measure?
  2. What are the normal, prediabetes and diabetes ranges?
  3. How do %, mmol/mol and average sugar line up?
  4. Why do Indian guidelines say HbA1c shouldn't be the only test?
  5. What else can make your HbA1c read high or low?
  6. What HbA1c is the target if you have diabetes?
  7. How often is HbA1c tested?
  8. What does an HbA1c test cost at private labs?
  9. Where do GLP‑1 medicines fit?
  10. Questions people ask
  11. How we researched this
  12. Sources

What does an HbA1c test measure?

It measures how much of the haemoglobin in your red blood cells has sugar stuck to it. That share tracks your average blood sugar over about the last 2 to 3 months.2,9

Haemoglobin is the protein in red blood cells that carries oxygen. Sugar in your blood sticks to it. The test reports the share of haemoglobin with sugar attached (glycated), as a percentage.9 The more sugar in your blood over those months, the higher the percentage.9

A finger-prick or fasting sugar test is a snapshot of one moment. HbA1c is closer to an average over months.2 You don't need to fast for it.1

Other names on lab reports: A1C, glycated haemoglobin or glycosylated haemoglobin.1,5,19 It is the same test. If you're new to these medicines, What is a GLP‑1? explains the hormone. Guide 1 explains why Indians get diabetes at lower weights.

What are the normal, prediabetes and diabetes ranges?

Below 5.7% is normal, 5.7% to 6.4% is prediabetes, and 6.5% or above is in the diabetes range. India's ICMR workflow and RSSDI-ESI guideline use the same lines as the American Diabetes Association.1,4,5

RangeHbA1c (%)HbA1c (mmol/mol)Average sugar it matches
NormalBelow 5.7%Below 39Below about 117 mg/dL
Prediabetes5.7% to 6.4%39 to 47About 117 to 137 mg/dL
Diabetes6.5% or above48 or aboveAbout 140 mg/dL or above

Cut-offs: ADA Standards of Care 2026 (Tables 2.1, 2.2), ICMR workflow for type 2 diabetes (July 2022), RSSDI-ESI 2020. Conversions: mmol/mol from the NGSP conversion; average sugar from the ADAG study formula (28.7 × HbA1c − 46.7), rounded by us.1,4,5,8,9

Prediabetes is a warning range. The ADA says 5.7% to 6.4% marks people at high risk of diabetes and heart disease.1 It treats above 6.0% (42 mmol/mol) as very high risk.1 India's national ICMR-INDIAB survey found prediabetes in 15.3% of 107,119 adults by glucose tests (21.0% by HbA1c in 18,090) and diabetes in 11.4%.13

One result is not a diagnosis. Unless sugar is clearly very high, the ADA asks for two abnormal results. That can be two different tests on the same blood draw, or the same test on two dates.1 The WHO also asks for a repeat HbA1c, unless there are symptoms and a sugar reading above 200 mg/dL.7

Below 6.5% doesn't rule diabetes out. The WHO says a lower HbA1c "does not exclude diabetes diagnosed using glucose tests".7 The ADA notes HbA1c picks up fewer cases than the 2-hour glucose test (oral glucose tolerance test, OGTT).1 The WHO set no formal cut-off below 6.5%; the 5.7% line comes from the ADA. RSSDI-ESI adopted it, and the ICMR workflow also uses it.4,5,7

"Normal range by age" tables. Some lab websites show a different normal HbA1c for each age group. The ADA, WHO, ICMR and RSSDI documents we read give one adult cut-off for diagnosis, not one per age.1,4,5,7 Age does change the target for people who already have diabetes; see the targets section below.

How do %, mmol/mol and average sugar line up?

India's RSSDI-ESI guideline asks for HbA1c to be reported as a percentage. Some reports also print mmol/mol, the international unit, or an average sugar in mg/dL. All three describe the same result.1,5,8,9

The NGSP, which standardises HbA1c tests, links the two units with one formula: % = 0.09148 × mmol/mol + 2.152.8 The ADAG study of 507 people turned HbA1c into an average sugar: mg/dL = 28.7 × HbA1c − 46.7.9 That formula held across age, sex, diabetes type and ethnic group in the study.9

  • 5.7% = 39 mmol/mol = about 117 mg/dL on average8,9
  • 6.5% = 48 mmol/mol = about 140 mg/dL8,9
  • 7% = 53 mmol/mol = about 154 mg/dL8,9
  • 8% = 64 mmol/mol = about 183 mg/dL8,9
  • 9% = 75 mmol/mol = about 212 mg/dL8,9

A worked example: a report of 7.4% means about 28.7 × 7.4 − 46.7, or roughly 166 mg/dL.9 Your finger-prick readings can still differ from that average. When the two keep disagreeing a lot, the ADA asks doctors to look for a problem.1

Why do Indian guidelines say HbA1c shouldn't be the only test?

India's RSSDI-ESI guideline keeps 6.5% as the line, but says HbA1c "cannot be used as 'sole' measurement" for diagnosis here. Common anaemia and inherited haemoglobin conditions can push the number off.5

The guideline says screening by HbA1c alone "would be inappropriate in most settings in India, at this time".5 It accepts HbA1c screening at a lab with external quality checks.5 It also warns the 6.5% line "may result in significant under diagnosis".5 Both the ADA and RSSDI-ESI want the lab to use an NGSP-standardised method.1,5 A 2024 RSSDI consensus calls the lack of NGSP-certified labs "the main limitation in India".23

Anaemia is common. In the national NFHS-5 survey (2019–21), 57.0% of women and 25.0% of men aged 15 to 49 were anaemic.11 Iron or vitamin B12 deficiency can raise HbA1c, according to the WHO.7

A Delhi study compared 62 adults with iron-deficiency anaemia and 60 healthy adults. HbA1c averaged 5.51% with anaemia vs 4.85% without.10 After 3 months of iron, it fell to 5.04%.10 Of 20 people whose first result was in the prediabetes range, 14 moved to normal.10 Of 6 in the diabetes range, 5 dropped to prediabetes and 1 to normal.10

Inherited haemoglobin conditions vary by region. A six-city study of 56,780 people found beta-thalassaemia trait in 2.78% overall, from 1.48% to 3.64% by state.12 Another variant, HbE trait, was found in 23.9% of people tested in Dibrugarh, Assam.12 In people who inherit HbE from both parents (HbEE), the ADA says HbA1c can't be measured at all.2 The WHO says these conditions can push HbA1c up or down, depending on the test method.7

RSSDI-ESI says anaemia should be ruled out before diagnosing on HbA1c.5 To check for an abnormal haemoglobin, it names a lab method called HPLC (high-performance liquid chromatography).5 In these cases, the ADA says fasting or 2-hour glucose tests should be used for diagnosis instead.1

What else can make your HbA1c read high or low?

Anything that changes how long red blood cells live, or the haemoglobin itself, can skew it. Pregnancy, blood loss, kidney failure and liver disease are on the lists.1,3,7

The WHO's 2011 report lists factors in each direction, depending partly on the lab method:7

  • Can push it up: iron or vitamin B12 deficiency, chronic kidney failure, heavy alcohol use, and removal of the spleen.7
  • Can push it down: erythropoietin injections (used in kidney disease), chronic liver disease, shorter red-cell life, and some haemoglobin variants.7
  • Common worldwide: haemoglobin disorders, certain anaemias, and conditions that speed up red-cell turnover, such as malaria.7

The ADA adds blood loss, transfusion and G6PD deficiency, an inherited red-cell condition. It says HbA1c may not suit diagnosis in people on dialysis or HIV treatment.1 In people with sickle cell disease (HbSS), HbA1c can't be measured at all.2

Pregnancy. HbA1c falls in a normal pregnancy, because red blood cells turn over faster.3 The ADA calls it a secondary measure in pregnancy, after glucose checks.3 India's ICMR workflow screens all pregnant women with fasting glucose in the first trimester. It reads HbA1c of 6.5% or more then as diabetes that started before pregnancy.4

What HbA1c is the target if you have diabetes?

For most adults, about 7% or below. Indian and US guidelines set it lower for some younger, healthy people. They set it higher for many older or frail people.2,4,6

  • ICMR workflow (India, 2022): 7.0% or below. A higher target may be acceptable for older people and those with serious other illness.4
  • RSSDI-ESI (India, 2020): below 7.0% lowers the risk of complications. A higher target may suit people who had too many lows (hypos) when control was tightened.5
  • RSSDI (India, 2022): about 6.5% for younger people with new diabetes. For many older people, 7% to 8%, or even 9%.6
  • ADA (US, 2026): below 7% (53 mmol/mol) for many adults, and below 6.5% for some in good health. Goals are less strict for frail or very ill people.2
  • Pregnancy (ADA): below 6% (42 mmol/mol) if reached without significant lows. Otherwise below 7%.3

Lower targets carry a higher risk of low blood sugar. The ADA's lower goal is for people at low risk of hypos, and RSSDI-ESI raises the target after repeated hypos.2,5 Our post on GLP‑1 medicines and low blood sugar covers which medicines raise that risk.

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How often is HbA1c tested?

With diabetes, every 3 to 6 months in India's RSSDI guidance. With prediabetes, once a year. Testing gets more frequent when the number is off target or treatment changes.4,5,6

  • RSSDI-ESI 2020 and RSSDI 2022: every 3 to 6 months. How often depends on the level, how stable it is, and treatment changes.5,6
  • ICMR workflow: every 6 to 12 months, or every 3 months if diabetes is uncontrolled.4
  • ADA: at least twice a year, and about every 3 months if you're not at goal or treatment recently changed.2
  • Prediabetes: both the ICMR workflow and RSSDI-ESI say to test yearly.4,5

What does an HbA1c test cost at private labs?

On 5 Oct 2026, the price shown was ₹430 at Dr Lal PathLabs (Delhi), ₹640 at Metropolis (Delhi) and ₹420 at Thyrocare (before coupons; MRP ₹672).16,17,18

  • Dr Lal PathLabs, Delhi: ₹430, the single price on its test page.16
  • Metropolis Healthcare, Delhi: ₹640, the single price on its test page.17 The same page's search summary says ₹400; we used the price shown on the page itself.
  • Thyrocare: MRP ₹672, crossed out, with ₹420 shown as the price before coupons, for the site's default location.18

A worked example: four tests a year at ₹430 cost ₹1,720; two a year cost ₹860.16 Prices change by city, and home collection may cost extra. We list these three chains as examples, not as a recommendation.

Aside: the government's CGHS scheme pays its approved labs at most ₹255 to ₹300 for HbA1c in the biggest cities. That is a cap on what CGHS pays, not a walk-in price.19 Guide 6 prices a full round of tests.

Where do GLP‑1 medicines fit?

GLP‑1 medicines lower HbA1c in type 2 diabetes. They are one option among several, and a doctor chooses based on your whole picture.14,15

Before you go further
  • GLP‑1 medicines are prescription-only in India. A government statement on 1 Apr 2026 said only endocrinologists, internal-medicine specialists and cardiologists can prescribe them.20 CDSCO expert-committee minutes attach a similar condition to some approvals (endocrinologist or internal-medicine specialist), but we found no rule covering every brand.21
  • The numbers below are trial averages, not a promise for any one person.
  • Fake and recalled pens exist; see how to spot fake GLP‑1 pens. All the risks are in Guide 5.

In a 30-week trial on Ozempic's US label (not the Indian one), 388 people with type 2 diabetes started near 8.1% HbA1c.14 It fell by 1.4 points on Ozempic (semaglutide) 0.5 mg, 1.6 on 1 mg, and 0.1 on a dummy injection.14 Below 7% was reached by 73% and 70% on Ozempic, vs 28% on the dummy.14 In SURPASS-2, everyone also took metformin and started at 8.28%. HbA1c fell 1.86 points on Ozempic 1 mg and 2.01 to 2.30 on Mounjaro (tirzepatide).15 A post on the medicines in depth is on the way: Ozempic and other GLP‑1s for type 2 diabetes in India. Until then, start with the type 2 diabetes reading path.

RisksThe risks, in brief
  • Stomach effects are the most common. In SURPASS-2, 17% to 22% felt sick (nausea) on Mounjaro and 18% on Ozempic 1 mg.15
  • Low blood sugar. The US Ozempic label (not the Indian one) says lows become more likely with insulin or a sulfonylurea such as glimepiride.14
  • Pancreatitis. The warning sign is severe stomach pain that won't go away, sometimes felt through to the back. The US Ozempic Medication Guide says to stop and call your healthcare provider right away.14
  • Gallbladder problems and dehydration. The US label warns of gallbladder disease, and of kidney injury when vomiting or diarrhoea dry you out.14
  • Thyroid warning. The US Ozempic label says it is not for anyone with a personal or family history of medullary thyroid cancer (MTC), or with MEN 2.14
  • Pregnancy. The US Ozempic label says to stop at least 2 months before a planned pregnancy.14
Full detail in Guide 5: Side effects and risks →
Get help now: call 112 if someone is very unwell, faints, or is confused or can't be woken. Our answer on when to call 112 on a GLP‑1 medicine lists the warning signs.

Questions people ask

HbA1c test kya hai?

HbA1c is a blood test that shows your average blood sugar over about 2 to 3 months. It measures the share of haemoglobin in your red blood cells that has sugar attached. Doctors use it to diagnose diabetes and to track it. You don't need to fast. A Hindi version of this page is planned.2,9,1

Do I need to fast before an HbA1c test?

No. The ADA says fasting is not required for HbA1c. A fasting sugar test is different: it needs at least 8 hours without food.1,4

Is an HbA1c of 6.0% normal?

No. 6.0% is in the prediabetes range of 5.7% to 6.4%. The ADA treats results above 6.0% as very high risk for diabetes. A single result is usually confirmed with a second test, and anaemia can push HbA1c up.1,10

Is the normal HbA1c range different by age?

The ADA, WHO, ICMR and RSSDI documents we read give one adult cut-off for diagnosis, not one per age. Age does change the target once you have diabetes. RSSDI 2022 allows 7% to 8%, or even 9%, for many older people.1,4,5,6,7

Can anaemia make my HbA1c wrong?

Yes. Iron deficiency can raise it. In a Delhi study, HbA1c averaged 5.51% with iron-deficiency anaemia vs 4.85% without, and fell after 3 months of iron. India's RSSDI-ESI guideline says anaemia should be ruled out before diagnosing on HbA1c.10,5

What is 48 mmol/mol in per cent?

48 mmol/mol is 6.5%, the diabetes line. 39 mmol/mol is 5.7%, where prediabetes starts, and 53 mmol/mol is 7%.8,1

How we researched this

On 5 October 2026 we read three sections of the ADA's 2026 Standards of Care: diagnosis, glycaemic goals and pregnancy. We read the ICMR workflow for type 2 diabetes, the RSSDI-ESI 2020 and RSSDI 2022 guidelines, and the WHO's 2011 HbA1c report. We also read a 2024 RSSDI consensus on glucose monitoring. The Indian anaemia figures come from the NFHS-5 fact sheet. The conversions use the NGSP and ADAG formulas, and we did the rounding.

We read lab prices on each chain's own test page on 5 October 2026. We list them without links, because the pages sell the test. We did not check coupons or home-collection fees. We found no Indian guideline giving age-based "normal" HbA1c bands, so we don't print any.

Before you move on

  • Below 5.7% is normal; 5.7% to 6.4% is prediabetes; 6.5% or above is the diabetes range.
  • One high result needs confirming before it counts as diabetes.
  • Anaemia, thalassaemia trait and pregnancy can make the number misleading.
  • With diabetes, the target is personal: often about 7%, higher for many older people.
Weight and health in IndiansSide effects and risksDoctor questions

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An independent guide to GLP‑1 medicines. We don't sell medicines or tests, take drug-company money or earn clinic or lab commissions. Once a month: new brands, price changes, approvals and recalls. How we write

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Sources

  1. American Diabetes Association Professional Practice Committee. 2. Diagnosis and classification of diabetes: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1):S27–S49. Tables 2.1–2.3, recommendations 2.1–2.4. Declared interests: see source 22. DOI · Full text
  2. American Diabetes Association Professional Practice Committee. 6. Glycemic goals, hypoglycemia, and hyperglycemic crises: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1). Recommendations 6.2–6.5. DOI · Full text
  3. American Diabetes Association Professional Practice Committee. 15. Management of diabetes in pregnancy: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1). Glycaemic goals in pregnancy. DOI · Full text
  4. Indian Council of Medical Research / Department of Health Research, Ministry of Health and Family Welfare. Standard Treatment Workflow: Diabetes mellitus type 2 (ICD-10-E11). July 2022. Diagnosis, prediabetes, metabolic targets, monitoring and pregnancy screening boxes. PDF
  5. Chawla R, Madhu SV, Makkar BM, et al. RSSDI-ESI clinical practice recommendations for the management of type 2 diabetes mellitus 2020. Indian J Endocrinol Metab. 2020;24(1):1–122. Joint guideline of RSSDI and the Endocrine Society of India. Screening and diagnosis, glycaemic targets and monitoring sections. DOI · Full text
  6. Makkar BM, Kumar CV, Saboo B, Agarwal S, for the RSSDI 2022 Consensus Group. RSSDI clinical practice recommendations for the management of type 2 diabetes mellitus 2022. Int J Diabetes Dev Ctries. 2022. Glycaemic targets and monitoring. DOI
  7. World Health Organization. Use of glycated haemoglobin (HbA1c) in the diagnosis of diabetes mellitus: abbreviated report of a WHO consultation. 2011. WHO/NMH/CHP/CPM/11.1. Recommendation and Annex 1. PDF
  8. NGSP (National Glycohemoglobin Standardization Program). IFCC standardization of HbA1c: master equation linking NGSP % and IFCC mmol/mol. Checked 5 October 2026. Conversions rounded by us. Link
  9. Nathan DM, Kuenen J, Borg R, et al. Translating the A1C assay into estimated average glucose values (ADAG). Diabetes Care. 2008;31(8):1473–8. 507 people. DOI · PMID 18540046
  10. Madhu SV, Raj A, Gupta S, Giri S, Rusia U. Effect of iron deficiency anemia and iron supplementation on HbA1c levels: implications for diagnosis of prediabetes and diabetes mellitus in Asian Indians. Clin Chim Acta. 2017;468:225–9. 62 people with iron-deficiency anaemia, 60 controls. DOI · PMID 27717800
  11. Ministry of Health and Family Welfare / International Institute for Population Sciences. National Family Health Survey (NFHS-5) 2019–21: India fact sheet. Indicators 95 and 97. PDF
  12. Mohanty D, Colah RB, Gorakshakar AC, et al. Prevalence of β-thalassemia and other haemoglobinopathies in six cities in India: a multicentre study. J Community Genet. 2013;4(1):33–42. 56,780 people. DOI · PMID 23086467
  13. Anjana RM, et al. Metabolic non-communicable disease health report of India: the ICMR-INDIAB national cross-sectional study (ICMR-INDIAB-17). Lancet Diabetes Endocrinol. 2023;11(7):474–89. DOI
  14. Novo Nordisk. Ozempic (semaglutide) injection, US prescribing information and Medication Guide, revised May 2026. Boxed warning, sections 5.2, 5.5, 5.6, 5.9, 8.3, 14.1 (Table 3) (US label, not the Indian one). PDF
  15. Frías JP, et al. Tirzepatide versus semaglutide once weekly in patients with type 2 diabetes (SURPASS-2). N Engl J Med. 2021;385:503–15. 1,879 people, all on metformin, 40 weeks. Funded by Eli Lilly. DOI · PMID 34170647
  16. Dr Lal PathLabs. HbA1c test page, Delhi: ₹430, single listed price. Lab chain website, checked 5 October 2026 (not linked).
  17. Metropolis Healthcare. HbA1c (glycated haemoglobin) test page, Delhi: ₹640, single listed price (the page's meta description says ₹400). Lab chain website, checked 5 October 2026 (not linked).
  18. Thyrocare. HbA1c test page, site default location: MRP ₹672 crossed out, ₹420 shown before coupons; "Fasting: Not required". Lab chain website, checked 5 October 2026 (not linked).
  19. Central Government Health Scheme (CGHS), Ministry of Health and Family Welfare. Office Memorandum F.No.5-16/CGHS(HQ)/HEC/2024(Part I), 3 October 2025, effective 13 October 2025, Annexure I. Tier I city rate for "Glycosylated Haemoglobin (HbA1c)" (LB122): ₹255 non-NABH, ₹300 NABH. PDF (copy hosted by IIT Bhubaneswar)
  20. Press Information Bureau (PIB Research). GLP-1 Drugs: Use, Risks, and Regulation. Government backgrounder, 1 April 2026. PDF
  21. CDSCO. Recommendations of the Subject Expert Committee (Endocrinology & Metabolism): 20–21 April 2023, item 1 (tirzepatide), and 13–14 February 2024, item 3 (semaglutide, Novo Nordisk). Committee minutes. April 2023 PDF (archived) · February 2024 PDF (archived)
  22. American Diabetes Association Professional Practice Committee. Disclosures: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1):S358–S362. 2 of the 20 committee members declare ties to Novo Nordisk and 1 to Eli Lilly. Full text
  23. Makkar BM, et al. RSSDI expert consensus for optimal glucose monitoring in diabetes mellitus in India and recommendations for clinical practice. International Journal of Clinical Metabolism and Diabetes. 2024. DOI 10.1177/30502071241293567. Glucose-testing section. PDF

Last checked 5 Oct 2026 · Next review due 5 Apr 2027 · Report an error

How this post was made. Written by the GLP Guidebook team from the sources above. It's general information, not medical advice. Talk to a qualified doctor about your own HbA1c result, and before starting, stopping or changing any medicine. How we write